1. Sprints
2. Agility Ladder Drills (a lot of them)
3. Plyometrics (focus on depth jumps, box jumps, standing long jumps, side lateral jumps, and single leg hops over barrier or line.)
4. Stadium Stairs, Stadium Stairs, Stadium Stairs!!! One of the best exercises to improve muscular endurance.
5. Cone Drills. Practice quick cuts, emphasizing plant foot and exploading off it.
Hope this helps.
Cheers